in building RDFSchemaLabelProvider i’ve had some interesting namespace problems. some namespaces are defined, ending with a “#”, which include the name of the definition file, some have no hash, no trailing slash, and define a URL where that file can be assumed to be, for example:

[xml] xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:foaf="http://xmlns.com/foaf/0.1">
[/xml]

This is a pain when trying to work out (a) which file to load and then (b) what the actual namespace should be for the content of that file – in the case of the rdf namespace the file is exactly as described – http://www.w3.org/1999/02/22-rdf-syntax-ns but in the case of foaf namespace the file is http://xmlns.com/foaf/0.1/index.rdf